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# Each wire carries a current of i 1a flowing in the

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Unformatted text preview: shown. y y I1=1A 4cm What is the B field at point P? x 4cm BB . z I2=1A Front view 3cm P Side view • What is the direction of B at P? y y . . . z P (A) (A) :40 y y z P (B) z P (C) . 90o z P (D) (D) Physics 212 Lecture 14, Slide 21 Physics Calculation Two parallel horizontal wires are located in the vertical (x,y) plane as shown. Each wire carries a current of I =1A flowing in the directions shown. y I1=1A µ0 I 2π r x 4cm BB . 4cm What is the B field at point P? B= y I2=1A Front view z 3cm P Side view • What is the magnitude of B at P produced by the top current I1? (µ0 = 4π x 10−7 T-m/A) (A) 4.0 x 10−6 T (B) 5.0 x 10−6 T (B) (C) 6.7 x 10−6 T (C) y . • What is r? – r = distance from wire axis to P µ0 I (4π ×10−7 ) × 1 B= = = 40 ×10−7 2π r 2π × .05 :45 4cm z r r = 32 + 42 = 5cm 3cm Physics 212 Lecture 14, Slide 22 Physics Calculation Two parallel horizontal wires are located in the vertical (x,y) plane as shown. Each wire carries a current of I =1A flowing in the directions shown. What is the B field at point P? y y I1=1A 4cm x 4cm I2=1A Front view Btop = 4 X 10-6 T • What is the magnitude of B at P? (µ0 = 4π x 10−7 T-m/A) (A) 3.2 x 10−6 T (A) (B) 4.8 x 10−6 T (B) (C) 6.4 x 10−6 T (C) BB . z 3cm P Side view (D) 8.0 x 10−6 T (D) y . 4cm 3cm z θ :49 B1 θ 5cm θ θ B2 B1x = B1 cos θ B2 x = B2 cos θ 4 Bx = 2 B1 cos θ = 2 × 4 ×10 −6 × = 6.4 × 10 −6 5 Physics 212 Lecture 14, Slide 23 Physics...
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